{"id":"CVE-2026-72328","state":"PUBLISHED","title":"accel/amdxdna: Fix potential amdxdna_umap lifetime race","description":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix potential amdxdna_umap lifetime race\n\namdxdna_umap_release() calls the blocking mmu_interval_notifier_remove()\nbefore removing the object from abo->mem.umap_list. If\naie2_populate_range() runs concurrently, it may obtain a reference to an\namdxdna_umap that is being released, leading to a potential use-after-free.\n\nUse kref_get_unless_zero() in aie2_populate_range() when acquiring a\nreference. If the reference count has already dropped to zero, release\nis in progress and the entry is skipped.","publishedAt":"2026-08-15T05:55:39.296Z","updatedAt":"2026-08-17T05:42:50.096Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"267809e2c56fbea486f7250c8a4acddcc3c54dc5","versionType":"git"},{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"91e8109ecffb925b6202d2737384df285b195bfb","versionType":"git"},{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"14f172eff9c19f8043a9858845f33cd034f3a41e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/accel/amdxdna/aie2_ctx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/accel/amdxdna/aie2_ctx.c"]}],"references":["https://git.kernel.org/stable/c/267809e2c56fbea486f7250c8a4acddcc3c54dc5","https://git.kernel.org/stable/c/91e8109ecffb925b6202d2737384df285b195bfb","https://git.kernel.org/stable/c/14f172eff9c19f8043a9858845f33cd034f3a41e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72328.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72328","state":"PUBLISHED","datePublished":"2026-08-15T05:55:39.296Z","dateUpdated":"2026-08-17T05:42:50.096Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.919Z"},"containers":{"cna":{"title":"accel/amdxdna: Fix potential amdxdna_umap lifetime race","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix potential amdxdna_umap lifetime race\n\namdxdna_umap_release() calls the blocking mmu_interval_notifier_remove()\nbefore removing the object from abo->mem.umap_list. If\naie2_populate_range() runs concurrently, it may obtain a reference to an\namdxdna_umap that is being released, leading to a potential use-after-free.\n\nUse kref_get_unless_zero() in aie2_populate_range() when acquiring a\nreference. If the reference count has already dropped to zero, release\nis in progress and the entry is skipped."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"267809e2c56fbea486f7250c8a4acddcc3c54dc5","versionType":"git"},{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"91e8109ecffb925b6202d2737384df285b195bfb","versionType":"git"},{"version":"e486147c912f653ef4b60a6c7dbd4168a4c56a9f","status":"affected","lessThan":"14f172eff9c19f8043a9858845f33cd034f3a41e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/accel/amdxdna/aie2_ctx.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/accel/amdxdna/aie2_ctx.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/267809e2c56fbea486f7250c8a4acddcc3c54dc5"},{"url":"https://git.kernel.org/stable/c/91e8109ecffb925b6202d2737384df285b195bfb"},{"url":"https://git.kernel.org/stable/c/14f172eff9c19f8043a9858845f33cd034f3a41e"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Exploitation requires local DRM ioctls (AMDXDNA_EXEC_CMD) and mmap/munmap on the AMD XDNA NPU accel node (/dev/accel/accel* or renderD*); there is no network, adjacent-radio, or physical-bus path to aie2_populate_range().\nAC:L - This is a lifetime race between munmap-driven amdxdna_umap_release() and command-submit-driven aie2_populate_range(); the attacker controls both sides with concurrent threads (unmap/invalidate vs EXEC_CMD), so no timing or state outside attacker control is required.\nPR:L - Vulnerable ioctls (CREATE_BO, EXEC_CMD, mmap) are registered with DRM_IOCTL_DEF_DRV flags 0 (no DRM_ROOT_ONLY/DRM_AUTH); any unprivileged local user permitted to open the AMD NPU accel device on Ryzen AI systems can trigger the race.\nUI:N - The attacker opens the device, maps buffer objects, and races munmap/invalidation against their own EXEC_CMD submissions; no separate victim user action or interaction is required.\nS:U - The use-after-free corrupts kernel heap objects within the same kernel security authority; it is not a VM escape, hypervisor breakout, or IOMMU DMA-boundary bypass as a direct consequence of the flaw.\nC:H - Use-after-free of kmalloc amdxdna_umap lets attacker-controlled heap spray reclaim freed notifier/range metadata; subsequent hmm_range_fault() and mm_struct dereferences enable arbitrary kernel memory disclosure.\nI:H - UAF on amdxdna_umap gives attacker control over hmm_range and PFN tables used before NPU job submission, enabling heap grooming for arbitrary kernel writes and control-flow hijack toward local privilege escalation.\nA:H - The race dereferences and mutates freed amdxdna_umap and associated mm_struct/hmm_range state, reliably causing kernel oops/panic; repeated concurrent unmap/submit cycles sustain denial of service on the NPU host."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:42:50.096Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}